如果在觸發條件中存在條件，如何在MySQL表中插入記錄

Question

BLUF：我想使用before insert觸發器來防止插入無效數據，而是將該數據存儲在另一個表中並帶有錯誤消息以供稍後檢查。

我有一張桌子，我的Raspberry Pi氣象站正在記錄天氣數據。有時候由於各種原因它有硬件故障，當發生這種情況時，它會爲特定的數據點返回-1000。

我試圖寫一個before insert觸發器，它會阻止這些記錄被寫入其他有效數據的表中。這部分似乎工作。但我也想把這些錯誤的記錄寫到不同的表格中。在測試時，壞數據按預期被拒絕，但沒有記錄正在寫入錯誤日誌表。

這是我寫的觸發器：

DROP TRIGGER IF EXISTS wx_beforeInsert; 

SET @ERROR_MESSAGE = ''; 

DELIMITER $$ 
CREATE TRIGGER `wx_beforeInsert` BEFORE INSERT ON WEATHER_MEASUREMENT 
FOR EACH ROW BEGIN 
    IF (NEW.AMBIENT_TEMPERATURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Ambient tempurature invalid. Record rejected."; 
    ELSEIF (NEW.GROUND_TEMPERATURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Ground tempurature invalid. Record rejected."; 
    ELSEIF (NEW.AIR_QUALITY = '-1000') THEN 
     SET @ERROR_MESSAGE = "Air quality invalid. Record rejected."; 
    ELSEIF (NEW.AIR_PRESSURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Air pressure invalid. Record rejected."; 
    ELSEIF (NEW.HUMIDITY = '-1000') THEN 
     SET @ERROR_MESSAGE = "Humidity invalid. Record rejected."; 
    END IF; 

    IF (@ERROR_MESSAGE <> '') THEN 
     INSERT INTO `weather`.`WEATHER_MEASUREMENT_ERRORS` 
     (`AMBIENT_TEMPERATURE`, 
     `GROUND_TEMPERATURE`, 
     `AIR_QUALITY`, 
     `AIR_PRESSURE`, 
     `HUMIDITY`, 
     `WIND_DIRECTION`, 
     `WIND_SPEED`, 
     `WIND_GUST_SPEED`, 
     `RAINFALL`, 
     `CREATED`, 
     `ERROR_MESSAGE`) 
     VALUES 
     (NEW.AMBIENT_TEMPERATURE, 
     NEW.GROUND_TEMPERATURE, 
     NEW.AIR_QUALITY, 
     NEW.AIR_PRESSURE, 
     NEW.HUMIDITY, 
     NEW.WIND_DIRECTION, 
     NEW.WIND_SPEED, 
     NEW.WIND_GUST_SPEED, 
     NEW.RAINFALL, 
     NEW.CREATED, 
     @ERROR_MESSAGE); 

     SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = @ERROR_MESSAGE; 
    END IF; 
END; 
$$ 

下面是創建任何人支承臺所需的腳本想盡力幫助誰：

CREATE DATABASE IF NOT EXISTS `weather` /*!40100 DEFAULT CHARACTER SET latin1 */; 
USE `weather`; 

-- Create the WEATHER_MEASUREMENT table if it doesn't exist 
CREATE TABLE IF NOT EXISTS `WEATHER_MEASUREMENT` (
    `ID` bigint(20) NOT NULL AUTO_INCREMENT, 
    `REMOTE_ID` bigint(20) DEFAULT NULL, 
    `AMBIENT_TEMPERATURE` decimal(6,2) NOT NULL, 
    `GROUND_TEMPERATURE` decimal(6,2) NOT NULL, 
    `AIR_QUALITY` decimal(6,2) NOT NULL, 
    `AIR_PRESSURE` decimal(6,2) NOT NULL, 
    `HUMIDITY` decimal(6,2) NOT NULL, 
    `WIND_DIRECTION` decimal(6,2) DEFAULT NULL, 
    `WIND_SPEED` decimal(6,2) NOT NULL, 
    `WIND_GUST_SPEED` decimal(6,2) NOT NULL, 
    `RAINFALL` decimal(6,4) DEFAULT NULL, 
    `CREATED` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    PRIMARY KEY (`ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=4126 DEFAULT CHARSET=latin1; 

CREATE TABLE IF NOT EXISTS `WEATHER_MEASUREMENT_ERRORS` (
    `ID` bigint(20) NOT NULL AUTO_INCREMENT, 
    `REMOTE_ID` bigint(20) DEFAULT NULL, 
    `AMBIENT_TEMPERATURE` decimal(6,2) NOT NULL, 
    `GROUND_TEMPERATURE` decimal(6,2) NOT NULL, 
    `AIR_QUALITY` decimal(6,2) NOT NULL, 
    `AIR_PRESSURE` decimal(6,2) NOT NULL, 
    `HUMIDITY` decimal(6,2) NOT NULL, 
    `WIND_DIRECTION` decimal(6,2) DEFAULT NULL, 
    `WIND_SPEED` decimal(6,2) NOT NULL, 
    `WIND_GUST_SPEED` decimal(6,2) NOT NULL, 
    `RAINFALL` decimal(6,4) DEFAULT NULL, 
    `CREATED` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    `ERROR_MESSAGE` varchar(50) NOT NULL, 
    PRIMARY KEY (`ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=4126 DEFAULT CHARSET=latin1; 

Answer 1

我覺得你插入在WEATHER_MEASUREMENT_ERRORS ia也回滾了。 嘗試使WEATHER_MEASUREMENT_ERRORS非事務性（ROLLBACK不適用於非事務性表）成爲MyISAM-Table。